Create RG if it doesn't exist

src/aosm/azext_aosm/definition_folder/reader/definition_folder.py

@@ -7,7 +7,7 @@
 from typing import Any, Dict, List
 
 from knack.log import get_logger
-
+from azure.mgmt.resource.resources.models import ResourceGroup
 from azext_aosm.common.command_context import CommandContext
 from azext_aosm.configuration_models.common_parameters_config import (
     BaseCommonParametersConfig,
@@ -71,10 +71,26 @@ def _parse_index_file(self, file_content: str) -> List[Dict[str, Any]]:
             )
         return parsed_elements
 
+    def _validate_resource_group_exists(self, config, command_context):
+        """Ensure resource group exists.
+
+        Using ResourceManagementClient:
+        - Check for existence of resource group from allDeployParameters.json.
+        - Create resource group if doesn't exist.
+        """
+        resource_client = command_context.resources_client
+        if not resource_client.resource_groups.check_existence(config.publisherResourceGroupName):
+            rg_params = ResourceGroup(location=config.location)
+            resource_client.resource_groups.create_or_update(
+                resource_group_name=config.publisherResourceGroupName,
+                parameters=rg_params
+            )
+
     def deploy(
         self, config: BaseCommonParametersConfig, command_context: CommandContext
     ):
         """Deploy the resources defined in the folder."""
+        self._validate_resource_group_exists(config, command_context)
         for element in self.elements:
             logger.debug(
                 "Deploying definition element %s of type %s",